The only function I don't understand in Linear vs Logarithmic Sweeps. When I switch from linear to log I don't see any change in the sine wave. I think I understand the difference, but how can you see this on the scope? Also, why would I need log over linear?
The key word is SWEEP. What this does is to change the frequency (rate) of the wave not the waveform.
It is easier to describe linear, this changes the freq at a steady rate.
Logrithmical changes the freq at a changing rate, the change is very similar to a square law.
How can this be seen on a scope?
Set the time base on the scope so that you can see 3 sine wave, then do not change the time base.
Start the sweep function and you should see the number sine wave on the scope increase on screen.
Linear should increase the number at a fixed steady rate.
Logrithmical, the number increases at a faster and faster rate.
Why is Log useful?
Because many of our sense are perceived in a logrithmical maner, eg to hear a double in volumne, the electrial level must be doubled. On a Log scale, this doubling looks like a linear straight line.
Try looking at data sheets and the freq response, the freq scale is always log.